NC30 running rich

BenBray · Spanner Monkey Joined: 05 Aug 2005 Karma :

My NC30, now the weather has picked up, is throwing out plenty of black deposits out the exhaust. The idle is set to what its supposed to be, and recently its started to backfire when running from high revs to low.

I recently had a whole new [but used Laughing

] exhaust system put on. The collector pipe had been shortened but the end can fits on fine.

Any ideas? Something to do with a shorter pipe? Needs the carbs balanced?

Thanks in advance.
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Current Bike: nc30

Timmeh · World Chat Champion Joined: 01 Nov 2006 Karma :

When was the last time you changed the air filter?

Also the V4s are very sensitive to changes in the exhaust system, if the last system was straight-through (i..e no baffles) then they might have upped the main jet to suit.

A carb balance won't really help, you only need to balance them if the engine RPM wanders around at idle, it has hesitant acceleration or hangs-up when you come off the throttle.
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

BenBray · Spanner Monkey Joined: 05 Aug 2005 Karma :

For some reason I didnt even think about the air filter and its done a good 7000 miles, will check tomorrow when its not sailing it down.

Many thanks,

Ben
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Current Bike: nc30

veze · Trackday Trickster Joined: 20 Jun 2007 Karma :

id have a look at your plugs aswell matey, but yes these little 4s are very sensitvie to changes in exhaust systems, as ive notice with my nc29. if you need any advice pop onto www.400greybike.info
were a good bunch, so there should be someone on there that can give you plenty of advice Smile

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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

BenBray · Spanner Monkey Joined: 05 Aug 2005 Karma :

Plugs are 1k miles old, replaced around two or three months ago, not checking them out of spite... and price Laughing

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Current Bike: nc30

veze · Trackday Trickster Joined: 20 Jun 2007 Karma :

lol tell me about it! that and my plugs are like the worst to get to in the world, shame the japanese didnt consider my fat ass bloke fingers when they designed there machines
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300